JP2006266440A - Air purging implement for combustible gas piping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air purging implement whereby air can be safely and surely replaced with a combustible gas without relying on perception and a knack, since when performing various construction works for a gas pipe to pass combustible gas, air remaining in the gas pipe is required to be replaced with the combustible gas after the construction works are finished. <P>SOLUTION: In order to structure this air purging implement for combustible gas piping, a tubular plug member 9 the outer diameter of which is reduced so as to form a reversely tapered shape is made to get engaged with the lower periphery of a cylindrical body 1 comprising a vertical part 2 and a bent part 3 and having an almost L-shape, in which a transparent portion is provided at least at the center of the vertical part 2, a level difference part 4 stretching inward is formed on the inner peripheral wall of a lower part slightly lower than the transparent portion, a determining sphere 5 having an outer diameter larger than the inner diameter of the level difference part 4 is disposed in the upper part of the level difference part 4 so that it can freely roll, and a shutter valve which can be freely opened and closed is mounted to the opening part 11 of the bent part 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an instrument used for air purging in gas piping work for combustible gas transportation, and more specifically, a combustible excellent in safety capable of replacing the air in the gas pipe with the combustible gas while avoiding the danger of gas explosion. The present invention relates to an air purge tool for gas piping.

When constructing gas pipes for transporting combustible gases such as city gas, air temporarily enters the target gas pipes. After the work is completed, air is exhausted and replaced with combustible gases. Work is required. Conventionally, the combustible gas is replaced with combustible gas by flowing the combustible gas into the gas pipe, pushing the air to the downstream side of the gas pipe by the pressure of the combustible gas, and the gas pipe from the air outlet opening at the end of the gas pipe. It was done by pushing it out and dissipating it into the open air.
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  When replacing air with combustible gas such as city gas, it is necessary to handle it carefully so that the mixed gas of combustible gas and air does not reach a dangerous explosion concentration. There is no difference in the outside air where the mixed gas is diffused. In general, when a combustible gas is introduced into a gas pipe and air is exhausted by its pressure, it is determined whether or not the exhausted gas is within the range of explosive danger concentration by a detector. Although it was dissipated in the outside air, it was very dangerous because the mixture gas ignited and exploded in the outside air when the gas mixture was within the range of dangerous explosion concentrations.

  On the other hand, since both city gas and air are colorless, it is impossible to visually determine the type and concentration of the gas being ejected, so the degree of replacement is also judged by the odor attached to the city gas. ing. However, this method is very unreliable depending on intuition and knack, and this method cannot determine whether the concentration of city gas has reached the explosion danger line, and there is always danger of ignition and explosion. Was. Furthermore, since the specific gravity of air and combustible gases such as city gas is different, air stagnation is likely to occur at the bottom and top of the gas pipe due to the difference in specific gravity, making complete replacement difficult. In particular, when the specific gravity of the combustible gas is smaller than that of air, the air stagnates at the bottom of the gas pipe, and it is difficult to completely replace the outlet from the top of the pipe. In addition, the state of the mixed gas varies greatly depending on the diameter and length of the gas pipe. In particular, in the case of a gas pipe with a large diameter and a long extension, there are many cases where air is left in the pipe.

  As a result of research to solve the above-mentioned problems related to the replacement work of air and combustible gas in the gas pipe, the present inventor develops an air purge tool that can perform replacement safely and reliably without relying on intuition or hang. The present invention is proposed here as the present invention.

  It consists of a vertical portion 2 and a bent portion 3 which is communicated with the upper end of the vertical portion 2 and bent in the lateral direction, and has a substantially L-shape in which a transparent portion is provided at least in the center of the vertical portion 2. A cylindrical plug member 9 having an outer diameter reduced to a reverse taper shape is slidably fitted to the outer periphery of the lower portion of the cylindrical main body 1 and is directed inward to the inner peripheral wall slightly below the transparent portion. An overhanging stepped portion 4 is formed, and a discrimination sphere 5 having an outer diameter larger than the inner diameter of the stepped portion 4 is movably disposed above the stepped portion 4, and further, substantially covers the bent portion 3. The above-mentioned problem has been solved by attaching a blower duct 13 having a diameter larger than that of the same in a coaxial shape and attaching an openable / closable shutter valve 12 to the opening 11 of the bent portion 3 to constitute an air purge tool for combustible gas piping.

  In the air purge tool for combustible gas piping according to the present invention, since the replacement of the combustible gas and air can be visually observed, anyone can perform any unsafe and dangerous work that relies on intuition and hang as in the past. Work can be performed safely and reliably. In addition, since the mixed gas diffused into the outside air is always diluted below the explosion limit, it can be prevented from igniting and exploding by the mixed gas, and the work environment can be kept safe. . Further, since the plug member 9 is slidably attached to the vertical portion 2 of the main body 1, the opening 16 through which the gas flows can be freely positioned from the vicinity of the bottom of the gas pipe 14 to the vicinity of the top of the pipe. The air in the pipe can be discharged reliably. On the other hand, since the plug member 9 is formed in a substantially tapered shape, it has an effect that it can be fitted into various air jets 15 having different diameters instead of one kind, and has an extremely high practical value. Have.

  The position of the opening into which the gas flows can be freely adjusted from the bottom of the combustible gas pipe to the top of the pipe by the vertical slide mechanism, and the concentration of the mixed gas is visually observed by the behavior of the discrimination sphere. In addition, the greatest feature is that the concentration of the mixed gas diffused into the outside air can be controlled below the explosion limit.

  FIG. 1 is a longitudinal sectional view of a combustible gas piping air purge tool according to an embodiment of the present invention.

  In the figure, reference numeral 1 denotes a main body of the air purge tool for the combustible gas pipe, which has a cylindrical shape, and is bent in a lateral direction that is provided integrally with the relatively long vertical portion 2 and the upper portion of the vertical portion 2. It consists of a bent portion 3. And in this Example 1, the main body 1 is comprised with the transparent acrylic pipe through which the inside can be seen. In addition, the whole may not be comprised with a transparent material, but only the center part of the perpendicular | vertical part 2 may be comprised with a transparent material, and you may make it provide the window which consists of a transparent material.

  A stepped portion 4 projecting inward is formed on the inner peripheral wall slightly below the central portion of the vertical portion 2 of the main body 1, and above the stepped portion 4, the inner diameter of the stepped portion 4 is larger than the inner diameter. The discrimination sphere 5 having a large outer diameter is arranged in a rollable state.

  Further, a gas sampling port 6 is provided slightly above the peripheral wall of the vertical portion 2, and a pipe 8 provided with a pipe opening / closing valve 7 on the way is connected thereto. Further, a cylindrical plug member 9 made of a soft synthetic resin whose outer periphery is reduced in a reverse tape shape is fitted to the lower portion of the vertical portion 2 so as to be slidable up and down. A number of fine uneven grooves 10 for preventing slipping are provided on the outer periphery of the plug member 9 along the circumferential direction.

  On the other hand, a shutter valve 12 is attached to the opening 11 at the tip of the bent portion 3 formed at the top of the vertical portion 2 so as to close the opening 11 so as to be freely opened and closed. Reference numeral 13 denotes a lever for opening and closing the shutter valve 12. Further, an air duct 14 having a diameter larger than that of the bent portion 3 is attached so as to cover the bent portion 3 substantially coaxially with the bent portion 3.

  This combustible gas piping air purge tool has the above-described configuration, and its usage is as follows. That is, the shutter valve 12 provided at the opening 11 at the tip of the bent portion 3 is opened, and the air valve 18 is provided at the end of the pipe of the gas pipe 14 to replace the air 18 with the combustible gas 17. The lower part of the vertical portion 2 of the main body 1 is inserted into the air outlet 15, and the position thereof is adjusted so that the opening 16 at the lower end is near the bottom of the gas pipe 14, and the plug member 9 is connected to the air outlet 15. Fits snugly. In addition, since the outer periphery of the plug member 9 has a reverse tape shape, it can be fitted into various air jets 15 having different diameters instead of one kind.

  In this state, the combustible gas 17 is fed into the gas pipe 14. Then, the air 18 in the gas pipe 14 is pushed downstream by the pressure of the combustible gas 17, flows into the vertical portion 2 of the main body 1 from the opening 16 at the lower end of the vertical portion 2, and rises upward. At this time, a pressure is applied from below to the discrimination sphere 5 that is arranged so as to be able to roll in the center of the vertical portion 2, so that the discrimination sphere 5 is floated upward by this pressure. Since the vertical portion 2 is made of a transparent member, the floating phenomenon of the discrimination sphere 5 can be observed from the outside, and the fact that gas is passing through the vertical portion 2 by this floating phenomenon is known. I can do it.

  Further, the specific gravity of the combustible gas 17 and the air 18 is different, and the combustible gas 17 is usually lighter than the air 18. Therefore, the combustible gas 17 passes through the vertical portion 2 more than when the air 18 passes through. Since the floating amount of the discrimination sphere 5 is smaller when it is, the behavior of the discrimination sphere 5, that is, how much the air 18 and the combustible gas 17 are replaced by the difference in the floating amount and the change thereof is known. I can do it.

  In addition, since the gas sampling port 6 is provided in the vertical portion 2, it is also possible to collect gas from here and examine its components with a detector (not shown) to know the degree of substitution more accurately. is there.

  In this way, when it is determined that the combustible gas 17 passing through the vertical portion 2 is within the concentration range where there is a risk of explosion by the behavior of the discrimination sphere 5 and the sampling of the gas, from the blower mechanism not shown, Air 18 is blown into the air duct 13, whereby the mixed gas discharged from the tip opening 11 of the bent portion 3 is diluted to be below the explosion limit and diffused into the outside air.

  On the other hand, a shutter valve 12 is provided in the opening 11 of the bent portion 3, which is necessary by closing the shutter valve 12 when the gas pressure in the main body 1 decreases or becomes zero. Accordingly, it is possible to block the inside of the main body 1 from the outside air, thereby preventing the flame from being sucked into the main body 1 from an external ignition source.

  As described above, in the air purge tool for combustible gas piping according to the present invention, the replacement of the combustible gas 17 and the air 18 can be visually observed. Anyone can carry out the work safely and securely. Further, the mixed gas diffused into the outside air is always diluted with air so as to be below the explosion limit, so that explosion can be prevented and the working environment can be kept safe. Further, since the plug member 9 is slidably attached to the vertical portion 2 of the main body 1, the opening 16 through which the gas flows can be freely adjusted from near the bottom of the gas pipe 14 to near the top of the pipe. The air 18 in the pipe can be reliably discharged. On the other hand, since the plug member 9 is formed in a reverse taper shape, the plug member 9 has an effect that it can be fitted into an air jet port 15 having a different diameter instead of a single type, and has extremely high practical value. It is.

  It can be widely used in construction related to gas pipes in general, such as gas pipes buried in the ground and gas pipes arranged in building structures.

Sectional drawing which notched and depicted a part of Example 1 of the air purge tool for gas piping which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Vertical part 3 Bending part 4 Step part 5 Discriminating sphere 6 Gas sampling port 7 Pipe opening / closing valve 8 Pipe 9 Plug member 10 Concavity and convexity 11 Opening part 12 Shutter valve 13 Lever 14 Air duct 15 Gas pipe 16 Opening part 17 Combustible gas 18 air

Claims (3)

It consists of a vertical portion 2 and a bent portion 3 which is communicated with the upper end of the vertical portion 2 and bent in the lateral direction, and has a substantially L-shape in which a transparent portion is provided at least in the center of the vertical portion 2. A cylindrical plug member 9 having an outer diameter reduced to a reverse taper shape is slidably fitted to the outer periphery of the lower portion of the cylindrical main body 1 and is directed inward to the inner peripheral wall slightly below the transparent portion. An overhanging stepped portion 4 is formed, and a discrimination sphere 5 having an outer diameter larger than the inner diameter of the stepped portion 4 is movably disposed above the stepped portion 4, and further, substantially covers the bent portion 3. An air purge tool for combustible gas piping, wherein an air duct 13 having a larger diameter is coaxially attached, and an openable / closable shutter valve 12 is attached to the opening 11 of the bent portion 3. 2. The air purge tool for combustible gas piping according to claim 1, wherein the main body is made of a transparent material. The air purge tool for combustible gas piping according to claim 1, wherein a gas sampling port (6) is provided on a peripheral wall of the vertical portion (2).

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